Document Scanner and Rectifier
Use Document Scanner and Rectifier
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About this tool
Flatten and clean up document photos with perspective correction, smart or manual edge selection, and scan-style enhancement.
- Images processed locally in your browser — nothing uploaded
- Export as PNG / JPG / WebP
- Batch processing with no usage limits
- No sign-up, works instantly
Compared with common image editing workflows
| Aspect | This tool | Typical alternative |
|---|---|---|
| Start point | Edit directly in the browser | Usually needs a desktop editor |
| Best for | Cropping, background removal, watermarking, resizing | Deep retouching and layered work |
| Export and sharing | Faster PNG/JPG/WebP export | More formats, but more steps |
Docs
Flatten and clean up document photos with perspective correction, smart or manual edge selection, and scan-style enhancement.
Core Features
- Perspective Correction: Uses four-corner perspective transformation to convert angled photos into front-facing views
- Contrast Enhancement: Built-in CLAHE adaptive histogram equalization for clearer pencil marks and faded text
- Manual Corner Marking: Click four corners on the image for precise control over the correction area
- Privacy Safe: Images are temporarily stored and automatically deleted after processing
- Cross-Platform: Pure web-based tool, works directly in your browser with no software installation
How to Use
- Upload the document or test paper photo to be corrected
- Click the four corner points in order (top-left -> top-right -> bottom-right -> bottom-left)
- Processing starts automatically once all four corners are marked
- Download the rectified image
Use Cases
- Correcting photos of test papers or homework for printing or archiving
- Perspective correction for photos of contracts, IDs, and documents
- Correcting whiteboard or blackboard content photos
- Book page photo correction
- Any scenario requiring conversion of angled document photos to front-facing views
Notes
- File size limit: 30MB
- Supported formats: JPG, PNG, WebP, BMP
- Mark corner points as accurately as possible on the actual document corners
- Manual marking is more precise than auto-detection and works well with complex backgrounds
Last verified: 2026-07-15
FAQ
Is it free?
Yes, completely free. No signup, no limits.
Why manual marking instead of auto-détection?
Manual marking is more précise and reliable than auto-détection, especially for test papers with complex backgrounds or uneven lighting. You control the exact correction area.
What formats are supported?
JPG, PNG, WebP, BMP. File size limit 30MB.
Will the result be clearer?
Yes, CLAHE contrast enhancement is applied automatically during rectification, making pencil marks and faded text much clearer.
Will images be saved?
No. Temporarily used during processing, automatically deleted afterwards.
Is this tool suitable for ecommerce, social media, or email images?
Yes. Ecommerce images usually need clean edges and consistent sizing, social images need stronger cropping and visual impact, and email images need smaller file sizes. Export different sizes for each target channel.
Are my images uploaded to a server?
Most image tools on the site prioritize local browser-side processing, which is better for privacy-sensitive assets. If any AI feature has a usage cap or depends on a cloud model, the page copy will call that out explicitly.
How do I choose between PNG, JPG, and WebP?
Choose PNG for transparent backgrounds, JPG for photos and heavier compression, and WebP when you want a better balance of quality and file size. If your target platform requires a specific format, follow that first.
Do I need to sign up, download, or install anything?
Most Gotokit tools are designed to open directly in the browser without a separate install. If a tool has a quota, browser requirement, or third-party dependency, the page copy will state that clearly.
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